COMP FINAL Pt 1 Flashcards
(147 cards)
1
Q
The most common complication for all ceramic crowns
A
FRACTURE (7%)
2
Q
What type is our articulator?
A
Semi-Adjustable
3
Q
the static relationship between the incising or masticating surfaces of the max or mand teeth
A
Occlusion
4
Q
a maxillomandibular relationship, INDEPENDENT OF TOOTH CONTACT, in which the condyles articulate in the anterior-superior position against the posterior slopes of the articular eminences
A
Centric relation
5
Q
What is the shape of the border movements in the horizontal plane?
A
rhomboid/diamond
6
Q
The angle formed in the horizontal plane between the pathway of the non-working condyle, the mandibular lateral translation, and sagittal is called:
A
Bennett angle
7
Q
A ____________ may occur when there is contact between the maxillary and mandibular posterior teeth on the same side of the arches as the direction in which the mandible has moved.
A
Working interference
8
Q
Optimum occlusion includes all of the following EXCEPT?
A) IN CR, solid and even contact on post teeth; slightly lighter contact on ant teeth
B) In medial excursive, working contacts (canine) disclude NW teeth
C) In protrusion, ant teeth disclude post teeth
D) Occlusal forces are along the long axis of teeth
E) In an UPRIGHT posture, post teeth contact more heavily than anterior teeth
A
EXCEPT B - IN LATERAL excursive, working contacts disclude non-working
9
Q
In Mandibular Movement PURE ROTATION = ?
A
: 20-25 MM
10
Q
The GREATER the overjet =
A
SHORTER the cusp
11
Q
What is the shape of the border movements in the sagital plane?
A
“looks like a tooth”
12
Q
Bimanual manipulation which is a component of the techniques for taking an interocclusal record is also known as:
A
Dawson’s technique
13
Q
You need at least______ reduction for gold crown and at least____ reduction for PFM/all ceramic crown
A
1- 1.5 mm = GOLD
1.5- 2 mm = PFM/All Ceramic
14
Q
PFM or all ceramic crown reduces structure by ___?
A
70%!
15
Q
the complete intercuspation of the opposing teeth INDEPENDENT of condylar position, sometimes referred as the best fit of TEETH regardless of condylar position
A
● Maximal intercuspal Position (MIP
16
Q
- Easily finished without soft tissue trauma
- Kept plaque free,
- Impression easily made,
- Restoration can be easily evaluated,
- Avoids trauma
A
Advantages of supragingival margins
17
Q
To prevent pulp damage the dentinal thickness should be?
A
Dentin thickness at least 1 mm
18
Q
T/F. Chemical solvents and surfactants are reccomended to help prevent pupal damage.
A
False.
Dentin bonding agent, Chemical solvents and surfactants NOT RECOMMENDED because that can cause PULPITIS
19
Q
Ideal Taper in tooth prep?
A
6-10 degrees (ideal) but up to 20 degrees clinically
20
Q
T/F. Prep should reduce planes as much as possible and prep should be flat.
A
False.
MUST keep buccal and lingual inclines (should NOT BE FLAT)
21
Q
Ideal Margin Placement
A
SUPRAgingival
22
Q
______ margin usually takes more tooth structure off than ______
A
SHOULDER takes off more than CHAMFER
23
Q
FIVE Factors affecting retention :
A
-Magnitude of dislodging forces ( sticky food, s.a)
-Geometry of the tooth prep (taper, undercut)
-Roughness of the fitting surface of the
restoration
-Materials being cemented (metal>gold)
-Film thickness and properties of the luting
agent or cement (ZPC)
24
Q
The most common complication for Post/Core is
A
POST LOOSENING (5%)
25
Deep or heavy chamfer -- mainly used for___? And its cavosurface is and width __ mm.
PFM or all ceramic restorations
90 degrees
1 mm width
26
What is your articulators brand name?
| Is it Arcon or Non-Arcon articulator?
- Whip Mix
| - Arcon
27
the static and dynamic contact relationship b/w occlusal surface of teeth DURING FUNCTION
Articulation
28
________ is when a single tooth is surrounded on both sides by an edentulous space.
A pier abutment
29
The most common complication for Resin Bonded FPD is
DEBONDING (23%)
30
Most common Diagnosis in the oral cavity overall:
Dental Caries, Periodontal Disease
31
Minimum C:R ratio is
1:1
32
_________ states that fixed partial dentures with short pontic spans have a better prognosis than those with excessively long spans. Long spans bend easier
Ante’s law
33
A STEEP curve of spee, then you will need _____?
SHORTER cusps
34
______ an artificial tooth on a fixed dental prosthesis that replaces a missing natural tooth, restores its function, & Usually fills the space occupied by clinical crown
Pontic
35
Optimum C:R ratio is
2:3
36
What is the shape of the border movements in the frontal plane?
Shield
| You carry your shield in front
37
VIP Disadvantage of PFM (Metal Ceramic Crown)
Significant tooth reduction (63-72%) by weight
38
Cavosurface line angle on shallow chamfer is ______
OBTUSE (more than 90 degrees)
39
Amount of reduction for CAST metal crown
- 0.5 mm reduction at margin
- 1.5 mm at functional cusp
- 1 mm at nonfunctional cusp
40
The most common complication for Single Crowns is
the need for ENDODONTIC TREATMENT (3%)
41
Draw Gypsum manipulation
I want SEX in my VAGINA EVERY CHANCE; TEAR/WORK my FRONT
42
________ imaginary line along which the restoration is placed onto or removed from the prep-- should be parallel to long axis of tooth
Path of insertion:
43
a lower height will _____ ____ and ______ rotation
decrease resistance
| Increases
44
______margin has the best esthetics b/c of less visibility of metal coping
SHOULDER
45
What will happen to compressive strength of the stone model after you increase W/P?
- DECREASE compressive strength
46
Axial walls prepped ____mm at taper ____?
3 mm
| < 10 degrees
47
The GREATER the overbite, ________
the LONGER the cusp
48
_____prevents dislodgment of the restoration by forces directed in an apical or oblique direction
Resistance
49
Why bevel functional cusps?
- space for adequate bulk of metal in area of heavy occlusal contact
- Resistance to compression
50
Crown margin should be ______to avoid bone resorption
2 mm ABOVE alveolar crest
In case of crown lengthening -- 3 mm from crest bone
51
The most common complication for FPD is
CARIES ON ABUTMENT (18%)
52
3 mainly used margin designs?
Chamfer
Deep or heavy chamfer
Rounded SHOULDER
53
● A finish line design for tooth prep in which the gingival floor meets the external axial surfaces at approx. 90 degrees (GPT-8 and 9); 90 degrees to axial wall
SHOULDER
54
__________ is when a single tooth is surrounded on both sides by an edentulous space.
A pier abutment
55
Optimal ferrule height is:
2mm
56
The roots of the remaining abutment teeth must possess a combined total surface area in three dimensions more than that of the missing root structures that are to be restored with the bridge; when the situation yields a poor prognosis for propersupport, double abutments may be required.
Ante's rule/law
57
Metal can bend but Porcelain fractures when past modulus of elasticity. To prevent this, what can be done?
Facial and lingual grooves on abutments can prevent metal bending
58
When you have 5-unit FPD on max arch with intermediate abutment the non-rigid connector should be located on ________?
distal aspect of the intermediate abutment
59
______ is a band of the restoration that encircles the
external dimension of residual tooth structure (part of the crown that braces the tooth to provide resistance to dislodgement and prevent fracture).
Ferrule
60
What are the types of pontics?
```
Ovate pontic
Saddle pontic (aka ridge lap)
Hygienic pontic
Modified Sanitary Pontic:
Conical Pontic
Modified ridge lap pontic (clinic)
```
61
IN the Tx of partial edentulism plan for ______ whether teeth supported FPD(s) or implant supported FPD. And avoid _______.
short span FPD
Long cantilever bridges
62
Contouring of tooth to tissue must be symmetric on B & L. If its symmetric, no food entrapment occurs.
Pontics- Gulls Law
63
For a 5 unit pier-abutment restoration, stress bearing device placed on _________ and the key should be placed on
middle abutment ;
the mesial side of the distal pontic
64
Phasing Treatment (5 stages)
*Do perio and operative first before you do pros bc pros relies on healthy soft and hard tissues *
○Urgent Phase: chief complaint
○Control Phase: eliminate infection and inflammation
○Re-evaluation Phase: after you eliminate source of disease you make sure patient can move on
○Definitive/Corrective Phase: ortho, fixed, surgical, etc.
○Maintenance Phase
*End = Step Card & Procedure codes - blueprint for patient*
65
When you have 5-unit FPD, aka ______ especially on the maxillary arch, must have a _______.
Intermediate (Pier)abutment = when every other tooth is missing
non-rigid connector ( serves as fulcrum - to have stress breaking)
66
_____ replace Coronal tooth structure that was lost due to caries, previous restorations or tooth fracture and may be fabricated from various restorative material.
Foundation Restorations
67
In preventing Anterior Cantilever Effect,a _______ arch is NOT favorable bc you have long cantilever pontic
U-shaped no favorable
want square
68
All of the following are guidelines to periodontium except:
A. Supragingival / exposed margins
B. Enough tooth Reduction
C. Axial Contour ( over vs
D.Biological width ( crown margin 2mm above Alv Cr)
E. Rough margins to increase surface area and increase rention
EXCEPT E.
Want Margins as smooth and even as possible
69
The most common complication for FPD is :
CARIES ON ABUTMENT (18%)
70
Diagnosis of Coronal Tooth Structure
MILD
MOD
MOD to SEVE
SEV
71
Material and design of a restoration is based on several factors. These selection factors include all the following EXCEPT:
a. Destruction of tooth structure
b. Retention
c. Resistance
d. Plaque control
e. Financial considerations
c. Resistance
72
The most common complication for Single Crowns is
the need for ENDODONTIC TREATMENT (3%)
73
Tooth Prep Purposes (3):
1. Space for restorative material
2. Removal of undercut or height of contour
3. Removal of unsound tooth structure including dental caries
74
Types of crowns
Full metal
Full Ceramic
PFM
75
The most common complication for Resin Bonded FPD is
DEBONDING (23%)
76
In preservation of tooth strx to prevent pupl damage Dentin thickness shld be:
at least 1mm
77
Sufficient retention is provided after tooth preparation for a Direct Restoration wld be a DX of
MILD Structural Damaged Dentition
78
In preservation of tooth strx to prevent pulp damage we must be aware that pulp chamber ______ with age
Decrease with age:more occlusogingivally than
| faciaolingually
79
Taper ( angle of convergence0 allows the Escape of _____
excess luting agent ( cement)
80
______ in cylindrical prep lead to preventing the restoration from seating
Slight undercuts
81
Defined as mechanical treatment of dental disease or
| injury to hard tissues that restores a tooth to original form.
Tooth Preperation
82
The most common complication for all ceramic crowns is
FRACTURE (7%)
83
Which aspects of a tooth preparation contribute to both retention and resistance form?
A. Magnitude of dislodging forces
B. Geometry of tooth prep
C. Physical properties of the luting agent & film thickness
D. All of the above
Answer: D
Also roughness of the fitting surface of the restoation
and materials being cemented
ALL factors affecting Retention
84
Which margin design can be described as sloping curve from the axial wall till the margin and mainly used in Cast restorations(e.g. metal crown or lingual margin of PFM crown). This design is often ______ in width and ____ degrees.
Chamfer
0.3 – 0.5 mm ; more than 90 degrees
85
Resistance form:
features of a prep that enhance the stability of the restoration and resist dislodgment along an axis other than path of insertion
86
Which is NOT an Indication for subgingival margins:
1. Dental caries, cervical erosion or existing restoration
subgingivally extended
2. If the proximal contacts is at or below the gingival crest
3. Additional retention and/ or resistance
4. Root sensitivity not controlled by dentin bonding agent
5. To keep margin palque free
6. Axial contour modification
5. SUPRA GING margins keep plaque low
87
To INC resistance, height : width =
4:10 or greater
88
the convergence of two opposing
external walls of a crown prep as viewed in
a given plane, e.g. MD or BL
Taper
89
To INC resistance, axial walls shld be:
3mm at taper >10 degrees
90
In tooth preparation the causes of injury are most likely
* Temperature ( use water w/hi speed)
* Chemical (dt bonding agent; dnt use chem solvent/surfc
* Bacterial (antimicrobial agents- combat w/ consepsis After prep and before cementation; remove all carious dentin)
91
All of the following are guidelines to preserve tooth strx except:
```
A. prepping partial vs full coverage
B.Maximum taper 20+ degrees
C. Maintain occlusal planes/geometry
D. Maintain maximal dentin thickness
E. Modest margin design ( chamfer)
```
EXCEPT B.
DO all these but use MIN taper 6-10 degrees
92
ADV and DisADV of deep chamfer
ADV
mod tooth reduc/destruct
min stress in tooth
DisADV
reduces crown stress
potential LIP formation
93
Which margin design is mainly used in PFM or all ceramic restoratios; tends to create Lipping and can be beveled? Typically ______ in width and ____ degrees.
Deep or heavy chamfer
1mm ; 90 degrees
94
All of the following are use for Mounted Diagnostic Casts except:
A. Serve as a complement tool in addition to clinical examination
B. Provide a legal proof of pt’s current occlusion
C. Allow clinician to evaluate pt’s occlusion in centric and eccentric positions
D. Prevents clinician to evaluate pt’s occlusion in centric and eccentric positions
E. Allow clinician to determine inter arch distance, relationship between
the teeth and alveolar ridge and allow clinician to make as many
alteration to as clinician’s desire w/ absence of the patient.
D. ALLOWS clinician to evaluate pt’s occlusion in centric and eccentric positions
95
The sequence of procedures planned for the treatment of a patient after diagnosis
TREATMENT PLAN
96
Process for Diagnosis and Treatment Plan
| starts with
Examination:
* ID chief complaint
* Hx
* Exams (Extraoral / Intraoral)
* Mounted Diagnostic Casts on a semi-adj articulator
* FMX and/or Panoramic Radiograph
97
Insufficient retention is provided after tooth preparation
SEV Structural Damaged Dentition
98
margin design where Stress concentration is at sharp internal line angle; is created with a Flat end diamond ; and requires More reduction
Shoulder
** note: Rounded shoulder ( used in PFM / all ceramic ; made with Modified flat end diamond)
99
Sequence of Treatment Plan
* Address Chief complaint
* Set Treatment Goal: Healthy Oral condition
* Certain Functional, Comfort and Esthetics considerations may be dealt with early in the Tx Plan
100
Phases of Treatment
* Urgent Phase
* Control Phase
* Re-Evaluation Phase
* Definitive Phase
* Maintenance Phase
101
Which of the following is not the advantages of supragingival margin?
```
A. Easily finished without soft tissue trauma
B. Kept plaque free
C. Esthetic restoration
D. Restoration can be easily evaluated
E. Impression easily made
```
C.
Supraging margin = less esthetic
102
Occlusal reduction for PFM and all ceramic crown should be:
: 2 mm
103
The _____ is an integral part of occlusal reduction. Lack thereof can cause a thin area (--> perforation) in
the casting OR may result in overcontouring and poor occlusion.
functional cusp bevel
104
ADV and DisADV of chamfer
ADV:
min tooth reduc ; min stress
DisADV:
Reduces crown strength ( ceramic)
Poor esthetics ( creamic)
105
_______ of the facial surface will destroy excessive tooth structure and lessen retention.
Overinclination
106
Inadequate _______can cause thin walls and a weak restoration or a bulbous, overcontoured restoration
axial reduction
107
any irregularity on the wall of a prepared tooth that prevents the withdrawal or seating of a crown or wax
pattern; when the divergence exists between the opposing axial wall or wall segments
Undercut:
108
The most common complication for Post/Core is
POST LOOSENING (5%)
109
As taper _____, retention _____.
As taper INCREASES, retention
| DEC.
110
Advantages of bevel. Select all that apply
A. Less marginal discrepancy (slip joint)
B. Aids in contouring the restoration
C.Burnishability
D. Porcelain blends better
EXPECT D. Porcelain blends better
no porcelain on bevel!
111
By limiting the paths of withdrawal, ____is improved
retention
112
To INC retention the geometry of the prep in considered. The more______, the more retentive.
EG: molar > premolar at the similar taper
surface area
113
optimum degrees of taper for:
Max Ant
Max Molar
Mand ant
Mand Molar
Max Ant 10
Max Molar 19
Mand ant 10
Mand Molar 22
114
you can limit the path of insertion by creating a
box or groove (2.5 x diameter of the bur - 1mm from margin)
| this INC resistance and retention
115
Which margin design can be described as a finish line design for tooth preparation in which the
gingival floor meets the external axial surfaces at approximately a right angle to the axial wall. Typically used in PFM crown?
Shoulder
116
In INC rentention the materials being cemented are considered. When cementing alloy which is better? With a core build up which is better?
base metal > gold with polycarboxylate
core or buildup material: composite vs. amalgam
117
Better Luting agent or cement for retention?
ZPC (zinc phosphate cement) < glass ionomer
< adhesive resin
OPP for resistance
118
DEF: prevents removal of the restoration along the path of insertion
Retention:
119
Better Luting agent or cement for resistance?
```
Adhesive resin (strongest) > glass ionomer > ZPC >
polycarboxylate > ZOE
```
120
prevents dislodgment of the restoration by forces directed in an apical or oblique direction
Resistance:
121
The determination of the nature of a disease ; dentification of problems and understanding the needs of the patien
DIAGNOSIS
122
ADV and DisADV of shoulder
ADV:
max esthetics
max crown strength
prevents over contouring
DisADV
MAX tooth destruct/reduct
MAX tooth Stress
123
The path of insertion of a preparation must be _____ to adjacent proximal contacts or it will be prevented from seating
parallel the
124
Occlusal reduction for a Gold crown:
1 – 1.5 mm
125
if the path is directed lingually, the facial surface will _______. It also may encroach on the _____.
intersect the lingual surface, creating a shorter preparation
pulp
126
Resistance area:
any areas of a prep under compression
127
If the path is directed facially, the prominent
| facioincisal angle may create _____
esthetic problems of overcontouring or opaque showthrough
128
imaginary line along which the
| restoration is placed onto or removed from the prep
Path of insertion:
129
The path of insertion of a preparation for a metal-ceramic crown should be
parallel the long axis of the tooth
130
To check out taper/ undercut how should you look at the prep?
30cm (12”) with one eye
½” at an angle with one eye
Preparations in the mouth are viewed
through a mouth mirror using one eye
131
The optimum crown-root ratio for a fixed partial denture abutment is ________. A ratio of ____is the maximum that is acceptable.
2: 3
1: 1
132
Difficulty = ______
Pt’s Factor + Technical Procedures
133
VIP Disadvantage of Full Cast Metal Crown
Removal of larger amount of tooth structure than partial coverage
-Adverse effects to pulp and periodontium
134
Happiness =
Reality - Expectation
135
Diagnoses in Prosthodontics
-Structural Damaged Dentition due to caries or trauma or wear ( MILD, MOD, MOD to SEV, SEV)
-Defective Restoration (margin, loss of interproximal or hypo- or hyper- occlusal contacts, contour, or internal fit)
•Shade mismatch of existing crown
•Ill fitting restoration
•Trauma from occlusion due to existing restoration
•Worn down dentition
•Non restorable tooth
•Partial Edentulism
•Complete Edentulism
136
Sufficient retention is provided after tooth preparation for an In-Direct Restoration i.e. Inlay or Only or ¾ Crown or 7/8 Crown
MOD Structural Damaged Dentition
137
There is one unit of deflection (x) for
a given span length (p). Deflection on bridge from occlusal load → failure and increases by a factor of ____ for each missing tooth
3
**The deflection will be eight times as
great (8x) if the span length is doubled (2p)
27 times as great (27x) if the span length is
tripled (3p) **
138
There is one unit of deflection (x) for
| a pontic with a given thickness (t). There will be ____ times as much deflection if the thickness is decreased by ____.
8x
There will be eight times as much deflection (8x) if
the thickness is decreased by one-half (t/2).
139
For single crown -- noble metal alloy = ______. While a base metal = ____
0. 3-0.5. - noble metal alloy
| 0. 2mm = base metal
140
6 principles of Tooth Prep:
- Biological consideration
1. Preservation of tooth structure
2. Preservation of the periodontium
3. Marginal integrity
- Mechanical consideration
1. Retention and resistance
2. Structural durability
-Esthetic consideration
141
Sufficient retention is provided after tooth preparation for a Full Coverage Restoration based on the selected restorative material.
MOD to SEV Structural Damaged Dentition
* Taper 15-20
* 3-4 mm wall height
* Presence of Ferrule of 1.5-2.0 mm for an ETT
142
The walls of facial and lingual____ can counteract mesiodistal torque resulting from force applied to the pontic.
grooves
The retainers on secondary abutments will be placed in tension when the pontics flex, with the primary abutments acting as fulcrums.
143
states that fixed partial dentures with short pontic spans have a better prognosis than those with excessively long spans. Long spans bend easier.
Describe Ante's Law
144
Diagnostic Criteria of Prosthodontic Diagnostic Index (PDI) for Completely Dentate Patient
* Class I: Minimally Compromised
* Class II: Moderately Compromised
* Class III : Substantially Compromised
* Class IV: Severely Compromised
145
Diagnostic Criteria of Prosthodontic Diagnostic Index (PDI) for Completely Dentate Patient
* Tooth Condition
| * Occlusal Scheme
146
Considerations for Tx of Partially Edentulism using FPD
* Abutment Evaluation (C: R, Root Config, PDL area)
* Biomechanical (Deflection; Cantilever)
* Tilted Terminal Abutment
* Intermediate Abutment
147
In evaluating root configuration, which is better?
Divergent roots will be a better abutment tooth than one whose roots are fused
Greater faciolingual dimension = superior to the tooth whose root is essentially circular ( PM vs CI)
